Tabor Electronics 5251, User Manual

Page: 193 / 298

4
Remote Programming Reference
Modulated Waveforms Control Commands
4-59
Description
This command will download the data array that will cause the instrument to hop through the frequency list.
The dwell time for each frequency list item is fixed and can be programmed using the HOP:DWEL
command. Note that if you intend to program marker position, you must do it first and then load the
frequency hops list.
Below you can see how a hop table is constructed. The file sample below shows a list of 10 frequencies.
The 5251 will hop through this list, outputting the next frequency each time it hops. Note that the carrier
waveform is always sinewave and that the last cycle is always completed even if the dwell time is shorter
than the period of the waveform. For example, if you program dwell time of 1ms and the frequency step has
frequency of 1Hz (1s period), the frequency step will last 1 second although the dwell time is 1ms.
Sample Frequency Hops Data Array
1e+6 2e+6 3e+3 4e+6 5e+5 6e+2 7e+1 8e+6 9e+3 10e+5
Parameters
Name Type Description
<fix_hop_data> Double Block of binary data that contains information of
frequency values.
FHOP:FIX:DATA<var_hop_data>
Description
This command will download the data array that will cause the instrument to hop through the frequency list.
The dwell time for each frequency list item is variable and is supplied in the variable hop table data array.
Note that the HOP:DWEL command has no effect on this sequence. Also note that if you intend to program
marker position, you must do it first and then load the frequency hops list.
Below you can see how a hop table is constructed. The file sample below shows a list of 10 frequencies
and their associated dwell times. The 5251 will hop through this list, outputting the next frequency each time
it hops. Note that the carrier waveform is always sinewave and that the last cycle is always completed even
if the dwell time is shorter than the period of the waveform. For example, if you program dwell time of 1ms
and the frequency step has frequency of 1Hz (1s period), the frequency step will last 1 second although the
dwell time is 1ms.
Sample Frequency Hops Data Array
1e+6 100 2e+6 2000 3e+3 3e4 4e+6 40 5e+5 5e3 6e+2 6000 7e+1 0.7 8e+8e2 6 9e+3 90 10e+51000
In the above example, the first number is the frequency value and the second number is its dwell time.
Therefore, only even number of sets can be located in this table.
Parameters
Name Type Description
<var_hop_data> Double Block of binary data that contains information of
frequency hop values and their respective dwell time.
FHOP:MARKer<index>(?)